4A30.30 - Forces Produced by Thermal Contraction
Demonstrate the forces produced by thermal contraction.
Put on heat gloves. Heat steel bar with propane torch. Tighten screw until cast iron pin is firmly against the frame, taking up slack of expansion of rod. Be sure not to tighten too tight or you can manually break the pin. Either turn on fan or cool with water or let bar cool. When bar contracts, forces pin to snap due to the amount of the force produced by the contraction of the steel rod.